Not all PoS is the same, and if it's not done right it will have security flaws.

That said, PoS is like mining without mining gear or extra electricity, and that is why I like it. I used to be a Bitcoin miner for PoW but I am not anymore. You can eventually make more via PoS minting than with PoW mining. Essentially, Your coins are the miners. Think of it that way.